Notes

Running MariaDB Galera Cluster 5.5 and 10.0 nodes in a cluster is not
supported (MDEV-6257)

This version of MariaDB Galera Cluster supports wsrep API v25 which means
MariaDB Galera Cluster can be used with either a 25.2.x or 25.3.x
Galera wsrep provider. A 25.3.x wsrep provider is included in the
MariaDB repositories and is also available from the
downloads page.

On Ubuntu and Debian, the Galera Arbitrator daemon (garbd) and the galera
library are in two separate packages. The packages are named galera-3
and galera-arbitrator-3. When installing MariaDB Galera Cluster on Ubuntu and
Debian (the mariadb-galera-server package), the galera-3 package will be
automatically installed. You can then install the arbitrator package on a
separate node (recommended) or on one of the nodes running
mariadb-galera-server (not recommended).

Note: If Galera 25.2.x and 25.3.x are both being used in the cluster, MariaDB
with Galera 25.3.x must be started with
wsrep_provider_options='socket.checksum=1' in order to make it backward
compatible with Galera v2. Galera wsrep providers other than 25.3.x or 25.2.x
are not supported.

Thank you for using MariaDB Galera Cluster!

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